Kriyat HaTorah

1. From the time the Sefer Torah is opened to make the Brachot HaTorah it’s forbidden to speak at all even words of Torah. Giving a halachic ruling is forbidden unless it’s in order to prevent someone from doing a prohibition and it’s impossible to signal to him.
2. Someone who speaks during Kriyat HaTorah is culpable for serious transgressions including disgracing Torah by ignoring listening to Torah, making a Chilul Hashem, potentially Lashon Hara, Rechilut or other forbidden speech, speaking mundane words in a shul and the punishments include having one’s Tefillah discarded and a trangession that’s too great to bear.
3. Even between Aliya’s it’s forbidden to talk but it’s permissible to learn Shenayim Mikra VeEchad Targum and some permit learn other things, yet others emphasize not to learn with someone else between Aliya’s because it may continue into Kriyat HaTorah.
4. Some say it’s proper to read along with the Baal Koreh word by word in order to listen better and have inten, while others say that one should be quiet and listen intently.
5. It’s permissible to sit during Kriyat HaTorah and such is the minhag, yet some are strict to stand during Kriyat HaTorah (so as to hear it as if one is receiving it from Har Sinai when Bnei Yisrael was standing). During Baruch and Baruch HaMiverech LeOlam VeEd one should stand, however, many don’t stand and the minhag has what to rely on.
6. If one already heard Kriyat HaTorah (or one will hear another minyan), there’s 10 others who are listening to Kriyat HaTorah, if he was sitting on the side (showing he already heard Kriyat HaTorah) learning from before the Sefer Torah was open it’s permissible to learn quietly.